LinuxQuestions.org - gmp.h can't be found on chapter 6.13

Hello,

Im now working on chapter 6.13 MPFR-2.3.2
When i do the configure command i get this message:
Code:
root:/sources/mpfr-2.3.2# ./configure --prefix=/usr --enable-thread-safe

checking for a BSD-compatible install... /tools/bin/install -c

checking whether build environment is sane... yes

checking for a thread-safe mkdir -p... /tools/bin/mkdir -p

checking for gawk... gawk

checking whether make sets $(MAKE)... yes

checking whether to disable maintainer-specific portions of Makefiles... yes

checking build system type... i686-pc-linux-gnu

checking host system type... i686-pc-linux-gnu

checking for gcc... gcc

checking for C compiler default output file name... a.out

checking whether the C compiler works... yes

checking whether we are cross compiling... no

checking for suffix of executables... 

checking for suffix of object files... o

checking whether we are using the GNU C compiler... yes

checking whether gcc accepts -g... yes

checking for gcc option to accept ISO C89... none needed

checking for style of include used by make... GNU

checking dependency style of gcc... gcc3

checking for ICC... no

checking for function prototypes... yes

checking how to run the C preprocessor... gcc -E

checking for grep that handles long lines and -e... /bin/grep

checking for egrep... /bin/grep -E

checking for ANSI C header files... yes

checking for sys/types.h... yes

checking for sys/stat.h... yes

checking for stdlib.h... yes

checking for string.h... yes

checking for memory.h... yes

checking for strings.h... yes

checking for inttypes.h... yes

checking for stdint.h... yes

checking for unistd.h... yes

checking for string.h... (cached) yes

checking for an ANSI C-conforming const... yes

checking for working volatile... yes

checking for main in -lm... yes

checking whether time.h and sys/time.h may both be included... yes

checking limits.h usability... yes

checking limits.h presence... yes

checking for limits.h... yes

checking float.h usability... yes

checking float.h presence... yes

checking for float.h... yes

checking locale.h usability... yes

checking locale.h presence... yes

checking for locale.h... yes

checking for string.h... (cached) yes

checking stdarg.h usability... yes

checking stdarg.h presence... yes

checking for stdarg.h... yes

checking sys/time.h usability... yes

checking sys/time.h presence... yes

checking for sys/time.h... yes

checking sys/fpu.h usability... no

checking sys/fpu.h presence... no

checking for sys/fpu.h... no

checking for memmove... yes

checking for memset... yes

checking for setlocale... yes

checking for strtol... yes

checking for gettimeofday... yes

checking for union fpc_csr... no

checking for fesetround... yes

checking for gcc float-conversion bug... yes, use -ffloat-store

checking for denormalized numbers... yes

checking if NAN == NAN... no

checking if charset has consecutive values... yes

checking for math/round... no

checking for math/trunc... no

checking for math/floor... yes

checking for math/ceil... yes

checking for math/rint... no

checking for long double... yes

checking format of `long double' floating point... IEEE extended, little endian

checking for TLS support... yes

checking for gmp.h... no

configure: error: gmp.h can't be found, or is unusable.
GMP was compiled and installed without any errors.
On the test all 139 test were succeed.

What now ?

Roelof